{ config, ... }:

let
  d = config.xdg.dataHome;
  c = config.xdg.configHome;
  cache = config.xdg.cacheHome;
in
rec {
  # add environment variables
  systemd.user.sessionVariables = {
    # clean up ~
    LESSHISTFILE = cache + "/less/history";
    LESSKEY = c + "/less/lesskey";
    WINEPREFIX = d + "/wine";

    # set this variable make i3 failed to start
    # related issue:
    #   https://github.com/sddm/sddm/issues/871
    # XAUTHORITY = "$XDG_RUNTIME_DIR/Xauthority";

    # set default applications
    BROWSER = "firefox";
    TERMINAL = "alacritty";
    TERM = "xterm-256color";

    # enable scrolling in git diff
    DELTA_PAGER = "less -R";

    MANPAGER = "sh -c 'col -bx | bat -l man -p'";
  };

  home.sessionVariables = systemd.user.sessionVariables;
}